70results about How to "To achieve the purpose of vibration reduction and noise reduction" patented technology

The invention belongs to the technical field of acoustics, and discloses a novel ultra-thin acoustic wave impedance transformer. The transformer is characterized by comprising one or more impedance transformation units, wherein, each impedance transformation unit is composed of a frame, multiple layers of prestress films or multiple layers of prestress string nets, and multiple layers of acoustic material. A hole cavity which is penetrated through the upper and lower sides is formed in the frame, the prestress films or prestress string nets, and acoustic material are alternatively placed in the hole cavity, namely, from one end of the hole cavity, a layer of prestress film or string net, a layer of acoustic material, a layer of prestress film or string net and a layer of acoustic material are sequentially arranged in a circular manner until the hole cavity is filled. The hole cavity can be designed to different shapes, comprising variable cross-sections and uniform cross-sections. Before each layer of prestress film or string net is placed into the hole cavity, the prestress is required to be applied, and the size of the prestress is decided by the impedance expected to be achieved by the layer of prestress film or string net. The transformer can achieve the rapid variation of the impedance from low to high or from high to low, and the ultra-thin design is achieved.

The invention provides a variable damping vibration attenuation device. Based on the variable cross section design of a suspender rod member, according to different washing load capacities and different drying stages, the relative positions of a friction piece and the rod member change and the damping force of a suspender changes, so that the self-adaptive adjustment of damping of the system is achieved and the start of a drying transient state stage is stable and the noise in a drying steady state stage is reduced. The variable damping vibration attenuation device is especially suitable for large-capacity pulsator washing machines. The invention also provides a washing machine using the variable damping vibration attenuation device. The problems in the drying transient state and steady state stages of pulsator washing machines are better solved and the performances of vibration attenuation and noise reduction are excellent.

The invention discloses a low-noise and large-power hydraulic plunger pump. The low-noise and large-power hydraulic plunger pump comprises a cylinder, a flange, an accumulator, a plunger, piston shoes, a pressure plate, a steel ball, an inner sleeve, a spring, a main shaft, and a valve plate; the accumulator is arranged in an inner hole cavity of the plunger; the end face, near the end of the valve plate, of the inner hole cavity of the plunger is provided with a flange in which a plurality of small through holes are formed in the axial direction; one side, facing the valve plate, of the inner hole cavity of the plunger is provided with a small hole cavity, and the side, facing a blind end, of the inner hole cavity of the plunger is provided with a large hole cavity; and the accumulator is arranged in the large hole cavity of the inner hole cavity of the plunger. The hydraulic plunger pump has good sealing performance, low noise and high rated operating pressure.

A low-noise hydraulic plunger pump with energy accumulator installed in the central through hole of plugner is composed of cylinder, flange, energy accumulator, plunger, slide block, pressing disk, steel ball, inner sleeve, spring, mainshaft and flow distributor. Its advantages include accumulating and releasing energy to reduce pressure ripple, and low noise.

The invention discloses a constant-temperature low-noise oil sump of an engine. The main body of the oil sump is designed as the double-layer sandwich structure. The internal layer is made from the common steel plate while the external layer is made from the composite damping steel plate. The bottom of the main body of the oil sump is provided with an inlet pipe of cooling liquid and an electromagnetic valve. The upper end of the main body of the oil sump is provided with an outlet of cooling liquid while the lower end thereof is provided with a temperature sensor. Transmission lines are connected between the temperature sensor and the electromagnetic valve which are connected with a controller. The bottom of the main body of the oil sump is provided with a lubricant discharging outlet. The external side of the main body of the oil sump is pasted with damping rubber. The oil sump is characterized in that: the shell of the oil sump is modeled by the stamping of double-layer vibration-decreasing steel plates; the temperature of the oil sump shell is maintained within a certain range by the circulation of the cooling liquid in the sandwich structure; the damping performance decline of the damping steel plates, caused by the temperature rise of the lubricant of the engine, is eliminated so as to possibly increase noises; therefore the noise-reducing design is considered for the oil sump structure so as to achieve the purposes of decreasing vibration and reducing noise of the oil sump.

The invention relates to a three-dimensional gradient periodic structure plate with multiple band gap characteristics. The three-dimensional gradient periodic structure plate comprises a multi-layer solid plate base body, and m rows and n columns of short scatterer columns which are arranged to be raised in each layer of plate according to periodicity or quasi-periodicity. Therefore, a plurality of groups of periodic structure plates with short columns are stacked to form the three-dimensional periodic structure plate. The radius or the side length of the raised short columns on the same layerof the plates can be unchanged or can be gradually changed in the row or column direction according to a certain function rule. In the height direction, the height, radius or side length of each layer of raised short columns is gradually reduced or increased according to a certain function rule to form the three-dimensional gradient periodic structure plate. Each layer of the periodic structure plate has a respective band gap characteristic. That means, elastic waves or sound waves in certain frequencies are significantly suppressed when propagating in the plate. The periodic structure can realize the integrated design of the structure and the vibration isolation system. The structure plate has the advantages of light weight, wide vibration isolation frequency, high reliability and the like. The structure plate has a wide application prospect in the field of engineering vibration isolation.

The invention relates to a compound damping layer vibration attenuation piece for noise reduction of a disc type brake. The compound damping layer vibration attenuation piece mainly comprises a brake caliper, an outer brake block, an inner brake block, a brake disc and a piston, wherein the two sides of the brake disc are respectively provided with the outer brake block and the inner brake block; the outside of the outer brake block is provided with the brake caliper; the outside of the inner brake block is provided with the piston; and vibration attenuation pieces are arranged between the outer brake block and the brake caliper as well as between the inner brake block and the piston. The invention has the advantages that, through improving a vibration attenuation structure of a traditional disc type brake by utilizing a simple and practical high molecular damping material, the invention enables vibrations of the brake blocks and the like which generate noise directly to greatly enhance vibration energy consumption due to the action of the compound damping layer, thereby achieving the purpose of vibration attenuation and noise reduction; moreover, the invention can be used for the vibration attenuation and the noise reduction of a fixed caliper or a floating caliper disc type brake.

The invention relates to a low-vibration low-noise electromechanical static pressure servo mechanism which comprises a control unit assembly and actuator assemblies, wherein two one-to-two oil ducts of the control unit assembly are respectively connected with two oil ducts of the two actuator assemblies through a hydraulic hose and a self-sealing connector; each actuator assembly comprises two actuators and two displacement sensors, and one displacement sensor is arranged in each actuator; the control unit assembly comprises a servomotor pump, a one-way valve, an isolating valve, a low-pressure pressure sensor, a pressure transducer, a self-pressurization oil tank, a differential pressure transducer, two high-pressure oil ducts and a low-pressure oil duct; and the assemblies are connected into the high-pressure oil duct or low-pressure oil duct. The servo mechanism has the advantages of compact structure, high reliability and favorable sound insulation and sound absorption effects, is convenient for demounting and interchange, and obviously lowers the vibration and noise.

The invention provides a motor and a compressor, wherein the motor comprises a rotor iron core and magnets arranged on the rotor iron core; each magnet is of a circular arc-shaped structure; the circular arc-shaped structure comprises an inner surface and an outer surface which are arranged at intervals; the inner surface is in a first arc surface shape matched with the rotor iron core; and the outer surface comprises an arc surface section in a second arc surface shape and tangent plane sections connected at the two ends of the arc surface section. By using the technical scheme, the magnets are of the circular arc-shaped structures, and the inner surface is in the first arc surface shape matched with the rotor iron core, so that the inner surface can be better attached to the rotor iron core; the air gap uniformity of a motor is ensured; and the performance of the motor is further ensured. Meanwhile, the outer surface also comprises the tangent plane sections connected at the two ends of the arc surface section; through the tangent plane sections, manufacturing materials of the magnets can be reduced; the air gap harmonic wave content is reduced; the goals of reducing vibration and lowering the noise can be achieved; and the problem of sinusoidal air gap flux density can be solved.

The invention provides a vibration damping and balancing device. The vibration damping and balancing device comprises an annular machine body and a plurality of guide pipes, wherein the annular machine body is provided with a plurality of liquid inlet passages distributed in the circumferential direction to receive a fluid injected from the outside of the vibration damping and balancing device; atleast a part of each guide pipe extends in the longitudinal direction, and starting ends of the guide pipes are fixedly connected with the liquid inlet passages respectively to discharge the fluid tothe outside of the vibration damping and balancing device. The vibration damping and balancing device can be set to use the fluid during work, and in a rotating device having eccentricity in a specific area, by injecting the fluid into the guide pipes opposite to the eccentricity, the eccentricity of an eccentric side is offset, so that the balance of the rotating device is better, and the vibration noise is reduced.

The invention relates to a motor with irregular tooth crests for reducing radial electromagnetic exciting force. The structure of the motor is the same as that of the motor in the prior art. The motor is characterized in that a plurality of teeth with irregular tooth crests are arranged on a stator core or a rotor core, or are simultaneously arranged on the stator core and the rotor core, the tooth crests of the teeth consist of a plurality of small teeth, each small tooth adopts a zigzag-shaped, ladder-shaped, semicircle-shaped, semi-elliptic-shaped, or wave-shaped structure. As long as the perimeters of the tooth crests are increased, the radial force is changed into the component force of the normal force, and the action for reducing the radial electromagnetic exciting force can be exerted. When the tooth crests of the teeth adopt the zigzag-shaped structures, the structures with one-way zigzags can be adopted, the structures with two-way zigzags can also be adopted, and included angles between the bevel edges and the radial edges of the zigzag-shaped structures can be selected according to requirements. The motor disclosed by the invention can be widely applied to various motors, such as permanent magnet motors, asynchronous motors, electro-magnetic synchronous motors, switch reluctance motors and the like.

The invention discloses an automotive acoustic superstructure for low-frequency broadband vibration reduction. The superstructure comprises at least two superstructure base plates; each superstructure base plate comprises at least one unit cell unit; each unit cell unit comprises a unit cell frame, a first mounting plate, a second mounting plate and a mass block body, the first mounting plate and the second mounting plate are respectively arranged at the left part and the right part of the unit cell frame from left to right, and the mass block body is detachably fixed to the first mounting plate and the second mounting plate. The automotive acoustic superstructure for low-frequency broadband vibration reduction is simple in structure, the band gap frequency range of the acoustic superstructure is widened, the total elastic wave energy dissipation amount of superstructure unit cells is greatly increased, it is guaranteed that vibration elastic waves transmitted from all directions can be well restrained, and the automotive acoustic superstructure is high in applicability and wide in application field.

The invention discloses a high-damping dual-frequency power damping gear transmission device. The high-damping dual-frequency power damping gear transmission device comprises an engagement frequency damping mechanism and a shaft driving rotating frequency damping mechanism. The engagement frequency damping mechanism comprises first compression springs, a guide rod and a mass block. The guide rod is sleeved with the mass block. The two ends of the guide rod are fixed to a pair of support frames. The first compression springs are arranged between the mass block and the support frames. The shaftdriving rotating frequency vibration damping mechanism comprises the mass block, a bearing and second compression springs. The outer side of the bearing is sleeved with the mass block. An inner ring of the bearing is mounted on a bearing mounting sleeve of a base. Upper compression spring seats and lower compression spring seats are arranged on the inner side of the mass block. Middle compressionspring seats are arranged between the upper compression spring seats and the lower compression spring seats. The second compression springs are arranged between the middle compression spring seats andthe upper compression spring seats and between the middle compression spring seats and the lower compression spring seats. By the adoption of the high-damping dual-frequency power damping gear transmission device, under the rated operating condition of a system, the problems of medium-high-frequency vibration and noise caused by the gear engagement vibration and shaft rotation vibration in the gear transmission system can be remarkably reduced.

The invention provides an acoustic shield based on acoustic wave band gap features of generalized photonic crystal semi-cylinder shells. The acoustic shield based on the acoustic wave band gap features of the generalized photonic crystal semi-cylinder shells comprises a shield body. The shield body is a square shell formed by connecting five base boards. The bottom end of the shield body is provided with a bottom edge connecting plate. The bottom edge connecting plate is provided with a threaded hole. The shield body is connected with a base through the bottom edge connecting plate. The inner surface of each base board is evenly provided with at least two semi-cylinder grooves. Each semi-cylinder groove is provided with the generalized photonic crystal semi-cylinder shell. Each generalized photonic crystal semi-cylinder shell is provided with at least two period components from inside to outside. Each period unit is composed of a non-metal layer and a metal layer from inside to outside in sequence, and each non-metal layer and the corresponding metal layer are attached to each other. Every two adjacent period components are attached to each other. The acoustic shield has the advantages of being large in sound insulation factor, convenient to assemble, disassemble and transport, low in design and manufacturing cost and the like. The acoustic shield has good damping and noise reduction effect on vibration within a band gap range.

The invention provides a transmission device for an automobile seat adjustor. The transmission device for the automobile seat adjustor comprises a screw rod, a worm wheel, a worm, an output bearing, an input bearing and a housing, wherein the worm wheel is arranged on the screw rod in a sleeving way; the worm rod drives the worm wheel to rotate; the output bearing is arranged at the two ends of the worm wheel; the input bearing is arranged at the two ends of the worm; the housing is used for fixing and bearing the input bearing and the output bearing. The worm wheel is provided with an internal thread matched with the screw rod, so that the worm wheel can perform reciprocating motion along the screw rod during rotation. The transmission device also comprises a guide bearing which is arranged at the periphery of the screw rod in a sleeving way and fixed with the housing; the guide bearing, the output bearing and the worm wheel are arranged at intervals in the axial direction. Due to the adoption of the transmission device, friction vibration between the guide bearing and the screw rod is prevented from being transmitted to the worm wheel, so that inclined cooperation of the worm wheel and the screw rod, noise generation and abrasion enhancement are avoided; the structure strength of the guide bearing can be improved, and corresponding forming materials are convenient to select to meet the supporting requirement of the worm wheel and the guide requirement of the screw rod respectively.

The invention discloses a pressurizing pump, a water purifier applying the pressurizing pump, and a water heater applying the pressurizing pump. The pressurizing pump comprises a pump body and a vibration reducing and noise lowering structure; the vibration reducing and noise lowering structure comprises at least one shell; each shell at least comprises a first vibration reducing and noise lowering layer, a middle layer arranged on the first vibration reducing and noise lowering layer in a sleeving manner, and a second vibration reducing and noise lowering layer arranged on the middle layer ina sleeving manner; and the first vibration reducing and noise lowering layer, the middle layer and the second vibration reducing and noise lowering layer jointly wrap the pump body. The technical scheme solves the noise problem, caused by the pressurizing pump, of an existing household appliance, and influences of vibration of the pressurizing pump on the household appliance are eliminated.

The invention relates to a motor for reducing a polar-frequency radial electromagnetic exciting force and a slot-frequency radial electromagnetic exciting force. The motor comprises a stator base in which a stator core is fixedly arranged. A rotor shaft is fixedly arranged in the stator base through bearings. A rotor core is fixed on a rotor shaft. The motor is characterized in that the motor further comprises a stator permanent magnetic pole, a rotor armature winding and a collector ring; the stator permanent magnetic pole is fixed in the stator core; the stator core is arranged between the N pole and the S pole of the stator permanent magnetic pole; the outer circumference of the rotor core is provided with a plurality of troughs uniformly; the rotor armature winding is arranged in the troughs; at one side or two sides of the rotor core, a collector ring is arranged on the rotor shaft; and after each winding in the rotor armature winding is connected with the collector ring, the winding is connected with an external stationary power supply circuit through an electric brush. The motor of the invention can effectively reduce vibration between the stator core and the stator base, thereby performing a function of reducing vibration and noise.

The invention discloses a portable rotary forcer vibration reduction gear transmission device for a high-damping shaft. The device comprises a vibration reduction mechanism, wherein the vibration reduction mechanism comprises a semi-vibration reduction mechanism A and a semi-vibration reduction mechanism B which are identical in structure; the semi-vibration reduction mechanism A comprises a connecting plate, a fixed seat, balls, a pressure spring and a rotary mass block; the fixed seat is fixed with a driven shaft, the rotary mass block is installed on an outer ring of the fixed seat, and theplurality of balls are installed between the fixed seat and the rotary mass block in the arc direction, so that the rotary mass block only has the degree of freedom of rotating around a rotary central shaft; the end part of the fixed seat protrudes relative to the end part of the rotary mass block, the connecting plate is fixed on the end part of the fixed seat, and the pressure spring is installed between the connecting plate and the end part of the rotary mass block; and the semi-vibration reduction mechanism A and the semi-vibration reduction mechanism B are fixed through the connecting plate. When the system is in a rated operation condition, the device can obviously reduce the problems of medium-high frequency vibration and noise caused by the rotation of a gear shaft in a gear transmission system.

The invention relates to a straight shaft plunger pump, in particular to a straight shaft plunger pump with a limiting arc-shaped slide rail balance. The straight shaft plunger pump comprises a pump body, a cylinder body, a plunger, a balance, two planar arc-shaped slide rails and a balance angle adjusting device, wherein the bottom of the balance is provided with two slide tracks; the two planerarc-shaped slide rails are arranged at the bottom of the pump body in a sliding mode with the slide tracks of the balance, and are used for supporting the balance; and the slide rails on at least oneside are transverse limiting arc-shaped slide rails and the slide tracks on the balance are transverse limiting arc-shaped slide tracks. The transverse limiting arc-shaped slide rails and slide tracks increase the side force of a contact surface, reduce the transverse play of the balance, improve the stress state of the balance, improve the smoothness of a rotor, lighten vibration and fulfill theaim of reducing noises of the whole pump. Besides, the assembly of the whole pump is more simplified, and the assembly accuracy is also improved.

The invention provides a sound insulation, vibration reduction and noise suppression multifunctional integrated metamaterial plate shell structure and a preparation method thereof. The sound insulation, vibration reduction and noise suppression multifunctional integrated metamaterial plate shell structure comprises an integrated metamaterial plate shell module and a matrix stiffened plate shell, and the integrated metamaterial plate shell module comprises a first bending vibration part, a coupling part, a second bending vibration part and an acoustic decoupling part; the acoustic decoupling part is located between the first bending vibration part and the second bending vibration part, and the edge of the first bending vibration part and the edge of the second bending vibration part are connected to the coupling part; and the first bending vibration part comprises a first substrate plate shell and a plurality of first resonance units arranged on the first substrate plate shell, and the second bending vibration part comprises a second substrate plate shell and a plurality of second resonance units arranged on the second substrate plate shell. The structure achieves the integrated design of the low-frequency sound insulation function and the low-frequency vibration reduction function, meanwhile, the development time from design to application is shortened, and space is saved.

The invention relates to a projected periodic structure plate with the gradient refractive index. The periodic structure plate comprises a base body plate (1) and m rows and n lines of scattering bodyvibrators convexly arranged on the base body plate (1) according to periodic arrangement, wherein the base body plate (1) and the scattering body vibrators jointly form an acoustic or elastic wave passing material with the negative refractive characteristics; the same scattering body vibrator is formed by an inner layer and an outer layer of materials including a vibrator inner layer (2) and a vibrator outer layer (3) through stacking; the negative refraction can be realized on emitted elastic waves or sound waves with the specific frequency; the gradual change of the refractive index is realized in the plate along the wave spreading direction by gradually changing the geometrical parameters of the vibrators, so that the elastic waves or sound waves with the specific frequency emitted into the structure from any direction can gradually bend; therefore the goal of controlling the wave spreading direction is achieved; the interference phenomenon exists between the emitting waves; the important value is realized in the fields of sound wave filters and the like.

The invention provides a turbine box which is used for a breathing machine and comprises an upper cap, a lower cover and a lower cap sequentially fixed arranged detachably. An air channel frame is arranged at a joint of the lower cap and the lower cover, turbine box air incoming holes are formed in the air channel frame and the lower cap corresponding to the air channel frame, and a first cyclone channel communicated with the turbine box air incoming holes and a second cyclone channel communicated with the first cyclone channel are arranged in the air channel frame; a turbine air inlet is arranged on the air channel frame and in the middle of the same and communicated with the second cyclone channel. By to the structure, gas rotates in the turbine box by a circle and enters a turbine through an air channel, circulation distance of the gas inside the turbine box is prolonged greatly, smoothness of gas circulation is guaranteed, outward diffusion of turbine noise through the air channel is reduced effectively, and noise of the turbine during working is lower. On the other side, the invention further provides the breathing machine with the turbine box.

The invention relates to a density-adjustable multilayer periodic structure. The periodic structure comprises a central thin film or a central plate base body layer (1), embedded block bodies (2) andouter side thin films or outer side plate base body layers (3), wherein the central thin film or the central plate base body layer (1) is positioned in the middle layer, the outer side thin films or the outer side plate base body layers (3) are arranged on the two sides of the central thin film or the central plate base body layer (1), the embedded block bodies (2) which are overally arranged in aperiodical mode are uniformly arranged in the outer side thin films or the outer side plate base body layers (3), so that the multilayer periodic structure is formed through stacking based on the above mode. The multilayer periodic structure is fixed on a frame with a large rigidity to be subjected to pre-stretching, the density of the periodic structure can be adjusted, so that the physical parameters of the periodic structure are changed, and the active control over periodic structure band gaps is realized; and the structure can be applied to the field of vibration reduction and vibration isolation, compared with a traditional active and passive vibration isolation structure, the periodic structure has the advantages of light weight, wide vibration isolation frequency, high reliabilityand the like, and meanwhile, the structure can be used for actively controlling the band gap range.

The invention discloses a symmetrical combined automobile transmission shaft. The symmetrical combined automobile transmission shaft comprises a shaft tube, a spline shaft, a telescopic sleeve and universal joints, wherein the spline shaft is arranged at the rear ends of the shaft tube and the telescopic sleeve; and the front end, near the telescopic sleeve, of the spine shaft is provided with spline teeth which extend into the telescopic sleeve and are engaged with the telescopic sleeve; the end, far away from the spline teeth, of the telescopic sleeve is provided with a first fork-shaped frame, the middle of the first fork-shaped frame is connected with one of the universal joints, the end of each universal joint is connected with a flange fork, and the end of each flange fork is provided with a flange plate; and the outer side of the telescopic sleeve is provided with an external thread and connected with a damping sleeve through the external thread, a rubber layer and a buffering layer are arranged on the inner wall of the damping sleeve, the buffering layer is arranged under the rubber layer and is of a hollow cavity structure, a plurality of elastic buffering balls are arranged in the buffering layer, a gap is reserved between every two adjacent elastic buffering balls, and the gaps are filled with foam particles. According to the symmetrical combined automobile transmission shaft, the damping buffering force of the damping sleeve and the transmission shaft tube can be further improved, and the purposes of vibration damping and noise reduction are achieved.

The invention discloses a buffering device for limiting and belongs to the technical field of safety protection. The buffering device comprises a limiting base, a first fastening plate, a ball bearing, a limiting guide rod, an elastic support component, a cover plate, a first sleeve, a second fastening plate and a vibration isolation panel, wherein the first fastening plate is arranged right abovethe limiting base; the ball bearing is arranged in the middle of the top of the limiting base; one end of the limiting guide rod is semi-spherical; the other end of the limiting guide rod is connected with the limiting base through the elastic supporting component; a limiting distance is kept between the cover plate and the first fastening plate; two axial ends of the first sleeve are opened; thesecond fastening plate and the cover plate are respectively arranged at the two axial ends of the first sleeve to form a sealed cavity; and the vibration isolation panel comprises a carbon fiber bearing layer and a vibration isolation interlayer, so that a vibration isolation device can adapt to different working conditions when the limiting rigidity of the vibration isolation device is not changed. The reliability and the working efficiency of the buffering device are improved. The limiting guide can be protected.

The invention relates to a repairable vibration-reducing track system of prefabricated steel spring floating plates. A main body of the repairable vibration-reducing track system is steel spring floating plates, and two types of steel spring floating plates are included; for one type, two vibration isolators are arranged under one steel rail of one prefabricated plate, and are carried out according to a mode that one vibration isolator is arranged at an interval of 2-3 fasteners (short for 2-3 arrangement); for the other type, three vibration isolators are arranged under one steel rail of one prefabricated plate, and are carried out according to a mode that one vibration isolator is arranged at an interval of 2 fasteners (short for 2-2 arrangement); the plate ends of the adjacent floating plates are connected by using a foundation longitudinal-vertical two-way fixed connector under a railway and a foundation longitudinal-horizontal two-way fixed connector under the railway. The repairable vibration-reducing track system has the advantages of fast construction speed, low construction difficulty, easiness of repairing and the like.

The invention relates to a supercell capable of forming a composite structure with multiple band gap periods. The supercell comprises a substrate (1) and scatterer oscillators (2) periodically arranged on the substrate. The scatterer oscillators (2) are divided into embedded oscillators (2-1) and convex oscillators (2-2). And the convex vibrators (2-2) are divided into convex vibrators A (2-2-1) and convex vibrators B (2-2-2). The periodic composite structure formed by the supercell elements has multiple band gaps, and can play a role in inhibiting propagation of elastic waves or sound waves in multiple frequency ranges. Therefore, the integrated design of the structure and the vibration isolation system is achieved, and the supercell has the advantages of being light in weight, wide in vibration isolation frequency, high in reliability and the like and has wide application prospects in the engineering vibration isolation field.

The invention relates to a self-adaptive power vibration reduction gear. The gear comprises a gear body, a plurality of vibration reduction modules are embedded in the gear body, each vibration reduction module comprises a vibration reduction mass block, a centrifugal mass block, an upper spring and a lower spring, mounting grooves are formed in the gear body, the vibration reduction mass blocks are fixed in the mounting grooves, connecting rods are further fixed to one sides of the vibration reduction mass blocks, the other ends of the connecting rods are fixed in the mounting grooves, the centrifugal mass blocks slide on the connecting rods, the upper springs and the lower springs are arranged on two sides of the centrifugal mass blocks respectively, the connecting rods are connected to the upper springs and the lower springs in a sleeving mode, one ends of the upper springs abut against the vibration reduction mass blocks, the other ends of the upper springs abut against the centrifugal mass blocks, one ends of the lower springs abut against the centrifugal mass blocks, and the other ends abut against the bottoms of the mounting grooves. According to the gear, in the power transmission process of the gear body, the purpose of self-adaptive vibration and noise reduction can be achieved within a certain rotating speed range, the rotating speed is not limited to a certain fixed rotating speed any more, and the purpose of vibration and noise reduction is achieved under the condition that the appearance and the space size of the gear are not increased.

A damping device of a shuttle tanker comfort superstructure and a manufacturing method are disclosed. The damping device comprises transverse toggle plate type plate frames, the transverse toggle plate type plate frames are welded and fixed to a left board and a right board of a front bulkhead and a rear bulkhead of a superstructure, and a plurality of horizontal cross beams and reinforcing ribs are welded to the transverse toggle plate type plate frames. The method comprises the steps that the transverse toggle plate type plate frames are positioned on a jig frame according to a drawing, and the positioning size of the reinforcing ribs and the position of the horizontal cross beam are marked on the transverse toggle plate type plate frames; the horizontal cross beam is welded to the transverse toggle plate type plate frames according to a scribing position; the reinforcing ribs are welded to the transverse toggle plate type plate frames, and the ends of the reinforcing ribs are directly welded to the horizontal cross beam; and after the damping device is integrally welded, the damping device is integrally hoisted and welded to the front and rear bulkheads of the superstructure. The damping device is simple and reasonable in design, remarkable in damping effect and capable of effectively reducing superstructure vibration power transmission so that the purposes of damping and noise reduction are achieved, meanwhile, the stability of a hull structure is ensured, and the comfort level of personnel is improved.

The invention relates to the technical field of track transit vibration isolation, and discloses a track vibration damping device including a vibration damping unit mounted between two adjacent fasteners of the track. The vibration damping unit comprises an outer box body which is connected with the track waist of the track and a mass body accommodated in the outer box body, and the gap between the outer box body and the mass body is filled with a damping liquid. The track vibration damping device provided by the invention is characterized in that a vibration damping unit is arranged on the track waist of the track, the vibration damping unit includes an outer case and a mass body accommodated in the outer case, so as to resize the mass, so that the characteristic frequency of the track vibration damping device is matched with the characteristic frequency of the track, so as to reduce the vibration of the track, reduce the noise radiated from the track, and make the internal mass vibrate through the damping liquid filled between the outer box body and the mass body. The damping liquid acts as the dissipation body of energy to consume the vibration energy of the track, so as to adjust the characteristic frequency of the track and reduce the vibration of the track.